feat: Expose the RequestTimeout configuration setting to app service

[lenny-goodell]

Added the RequestTimeout() method on the ApplicationService Interface
with returns a time.Duration. The questTimeout configuration setting
is pared during initialztion so error can be caught during start-up.

Signed-off-by: Leonard Goodell [email protected]

If your build fails due to your commit message not passing the build checks, please review the guidelines here: https://github.com/edgexfoundry/app-functions-sdk-go/blob/main/.github/CONTRIBUTING.md

PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?) N/A - Initialize can't be unit tested
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)
  feat: Document new RequestTimeout Application Service API edgex-docs#689

Testing Instructions

Add the following line app template main.go on this branch (around line 65)

	app.lc.Infof("Request Timeout is set to: %v", app.service.RequestTimeout())

Build and run app template
Verify the following is in the logs:

level=INFO ts=2022-02-02T22:18:43.2279695Z app=new-app-service source=main.go:65 msg="Request Timeout is set to: 5s"

Modify Service.RequestTimout in res/configuration.toml to be set to "5"
Rerun App Template and verify it fails to start-up with the following message:

level=ERROR ts=2022-02-02T22:29:13.1180933Z app=new-app-service source=factory.go:43 msg="App Service initialization failed: unable to parse Service.RequestTimeout configuration as a time duration: time: missing unit in duration \"5\""

New Dependency Instructions (If applicable)

N/A

[codecov-commenter]

Codecov Report

Merging #1039 (3118917) into main (935ffde) will decrease coverage by 0.16%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1039      +/-   ##
==========================================
- Coverage   68.90%   68.73%   -0.17%     
==========================================
  Files          36       36              
  Lines        2865     2872       +7     
==========================================
  Hits         1974     1974              
- Misses        780      787       +7     
  Partials      111      111              

Impacted Files	Coverage Δ
internal/app/service.go	54.51% <0.00%> (-1.22%)	⬇️

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